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Researchers reported that in a sample of U.S. women aged 50 to 54 who underwent mammography, 14.4% were recalled for further evaluation; however, in a similar sample of women undergoing mammography in the United Kingdom, only 7.6% were recalled for further evaluation.

What are the observed risk and odds ratios for the association between living in the United States (“exposed”) vs. the United Kingdom (“unexposed”) and being recalled for further evaluation following mammography (outcome)?

RR=1.89; OR=2.05 RR=2.05; OR=1.89 RR=0.40; OR=0.30 RR=0.30; OR=0.40 RR=2.05; OR=3.0

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    RR=1.89; OR=2.05

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